Sampling for analysing blood gas pressures

BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6986.1071c (Published 22 April 1995) Cite this as: BMJ 1995;310:1071

Arterial samples are the best

  1. Jaideep J Pandit
  1. Lecturer in medicine St Hugh's College, Oxford OX2 6LE

    EDITOR,—I cannot agree with Khavar Dar and colleagues' conclusion that capillary sampling should be used for analysing blood gas pressures in routine clinical practice.1 Tissue stabs yield a mixture of true capillary, arteriolar, and venular blood: the similarity of the sample to arterial blood depends almost entirely on the degree of “arterialisation” achieved by warming or rubbing the sample site. At worst the sample is similar to venous blood, and this is particularly so with vasoconstriction.2

    Although the authors found that for the partial pressure of oxygen the mean capillary value was within 0.09 kPa …

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